was a famous tv host, his son was brutally murdered. the crime never solved until now. we go inside the adam walsh killing. >>> and, apple's juice? we're on the scene as the company roms out another slimmer, lighter gizmo. so, how low can they go? tonight, we size up apple, by the numbers. >> announcer: from the global resources of abc news, with terry moran, cynthia mcfadden and bill weir in new york city, this is "nightline," march 2nd, 2011. >> good evening, i'm terry moran. and we begin tonight with another difficult chapter in the very public struggles of actor charlie sheen. last night, police removed his twin sons from his care after his estranged wife filed a restraining order against him. in an interview with abc earlier this week, sheen, one of four children himself, said he wasn't worried about his kids being negati negatively impacted by his lifestyle in all of this. i can say, hey, kids, your dad's a rock star, the actor said. here's andrea canning with the latest. >> reporter: police under court orders arrived at sheen's home last night to supervise the removal of the twins fro